Upright boiler with magazine above the zone of combustion



Dec. .15, 1931. M. TRESCHOW UPRIGHT BOILER WITH MAGAZINE ABOVE THE ZONE OF COMBUSTION Filed Jan, 31, 1929 2 Sheeg-Sheet l I NV E NT 0R= fli 77: lzow ism-f KM AT'IOR WETY.

Dec. 15, 1931. M. TRESCHOW UPRIGHT BOILER WITH MAGAZINE ABOVE THE ZONE OF COMBUSTION Filed Jan. 31, 1929 2 Sheets-Sheet 2 Patented Dec. 15, 1931 PATENT OFFICE MICHAEL TRESGHOW, OF COPENHAGEN, DENMARK UPRIGHT' BOILER WITH MAGAZINE ABOVE THE ZONE OF COMBUSTION Application filed January 31, 1929, Serial No.

Scientifically constructed magazine furnaces for bituminous fuel have heretofore not been used atall or at any rate not to a very great extent, in small wrought-iron steam or hot-water boilers for heating or similar purposes owing to the fact that such a combination has heretofore been too expensive.

There would, however, be a good market for such small steel-plate boilers, if they 19 could be had at reasonable prices. The object of the present invention is therefore to provide a magazine boiler suitableeven as far as the smaller sizes are concerned-for the arrangement of a magazine furnace for 5 bituminous fuel and buckwheat anthracite and with a furnace arrangement fully in correspondence with larger boilers, and that without influencing to any considerable extent the cost of manufacture per square foot 20 of heating surface.

The difiiculties in obtaining this result are that the arrangement of a furnace with sloping grates and a combustion chamber large enough for the developed combustion gases requires in itself considerable space, amongst other things because the width of the magazine and the corresponding part of the boiler must be rather considerable in order to permit the fuel to slide down, and since, as far as this kind of furnace is concerned, the main part of the heating surface of the boiler has had to be located beyond the combustion chamber or to consist solely of the plain orcurved side walls of the combustion chamher, the boiler of smaller size has heretofore become too bulky, and consequently too heavy and too expensive in comparison with its heating surface and efficiency.

According to the present invention this 10 ditficulty is removed in a simple and practi- I cal manner by constructing the combustion chamber in such a manner that it forms by itself a considerable part of the heating surface of the boiler, viz: by constructing the two transverse walls of the combustion chamber as rows of water-filled upright tubes welded lengthways together by means of bariron or the like and welded at top and bottom to cross-tubes communicating with the so water-space of the boiler. It is evident that 336,361, and in Denmark February 25, 1928.

in this construction the tube-walls mentioned above willhave a large closed surface, which in comparison with plain or curved hollow sheet-iron walls has the further advantage of being able to endure a high inside pressure. The foremost tube-wall forms a partition wall between magazine and combustion chamber, whilethe rear tube-wall forms a partition wall between the combustion chamber and the internal flue of the boiler (in such cases where the boiler has only one flue), so that this wall is exposed to the fire from two sides: from the combustion chamber and from the flue. In this way a cheap heating surface is procured, which is moreover easy to clean. In large boilers more fines-either parallel or in continuation of each othercan be procured by means of more tube-walls.

The contents of water, in the said tube-walls being very small, and both ends of the tubewalls being connected with the water-space of the boiler, these walls will cause a rapid circulation of the water-in the boiler and, consequently-form a very active heating surface, which only to a small extent increases the bulk of the boiler and does not increase its unproductive surface at all.

As compared with an ordinary water-tube surface, where the tubes are standing isolated, i. e. without being welded together lengthways by means of bar-iron or without being placed closely side by side, the above described closed tube-walls offer the advantage that the combustion gases are forced to follow a certain direction and thusin contradistinction to cases where the heating surface is formed by isolated tubesto pass the whole of the heating surface formed by the tubes and to do'that at an increased speed. A well known method of compelling the combustiongases to follow a certain direction between isolated water-tubes in a boiler is to place ordinarynot water-cooled, deflector plates between the rows of tubes. Such deflector plates, however, are very much exposed to destruction owing to the fact that they are not water-cooled, nor do they increase the heating-surface of the boiler like the above described strips of iron or bar-iron,

which are welded to the tubes, and both sides of which are acting as heating surface.

The tube-Walls may be formed by upright tubes welded together by means of iron strips or flat iron bars whereby two seams are required, but they may also be formed by tubes provided with corresponding longitudinal ribs rolled in one with the tubes, in which case there will be only one seam, viz: at theplace where the ribs are meeting, or the ribs may simply be placed side by side forming thus a practically tight tube-wall w1thoutbe ing welded.

Instead of welding flat bars or strips of iron between the upright tubes any suitable rolled shapes, for instance- T-iron, maybe used, whereby the heating surface is further increased, and that without any great eX- pense.

The'tube-wall ma Y alse beformed b tubes- 1 welded together before the tubes are inserted into the slot-shaped apertures made for this purpose in the cross-tubes, whereafter the longitudinalseams between'the edges ofthe'slot and the longitudinal side-walls of the rec tangular tube ends are made. In thelatter construction by which the long'vert-ical seams between the above mentioned strips of iron and the upright tubes are avoided, a tube-wall with a large surface and'tight enough for the'purpose is procure i Fig. 1 shows a vertical section of a hotwater boiler on the line C D in Fig; 2;

Fig. 2 a horizontal section of the boiler on the line A-B in Fig. 1;

3 the upper part of a tube-wall formed by upright tubes placed close to each other and welded at top and bottom to the crosstubes, and v F ig. at, in top viewthe upright tubes, as

shown on Fig. 3, welded together at the ends.

before being inserted into and welded to the cross-tube.

Fig. 5 a vertical section of a steam-boiler on the line 'CD'in Fig. 6, and

Fig. 6 a horizontal section of the same steam-boiler on the line ALB in Fig. 5.

a is the magazine of the boiler, 12 the combustion chamber, 0 the flue that leads the combustion gases from the combustion chamber into the outlet tube cl of-the boiler. The tubewall separating the combustion chamber from the magazine is marked 0, the tube-wall between the combustion chamber and the fine is marked f, the iron strips or bars welded to the upright water-tubes and connectingithe tubes with each other, so that they form a closed wall, are marked g. it indicates the cross-tubes, connecting, at top and bottom, the groups of upright water-tubes to the water-space of the boiler, i the removable return chamber placed on the upper part of the boiler, lathe inlet passage for secondary air which may be heated by passing through an air-jacket surrounding the return chamber and Z the discharge apertures left between the upright; watertubes and admitting the secondary air into the combustion chamber.

In order to avoid a too intense cooling of the combustion chamber the lower part of its cross-walls may be protected by firebricks m.

According to Fig:- 3' and Fig. 4, p indicat sthe' slot-shaped apertures in the crosstubes h, a the upright tubesand 0 the planes of contact of the same; at indicates the longitudinal seams between the edges of the slot 39 and thelong sides 01" the rectangular tube ends. in land 2" the boiler is shown with circular cross-section, but the boiler may of course also be made with a differently shaped cross -section, as shown in Figs. 5 and 6.

Having thus describedmy invention, what claim is:

An upright boiler,comprising a jacketed sheet metal housing enclosing the water space of the boiler, spaced vertical transverse partitions within said' housing dividing the interior thereof into compartments forming a fuel magazine disposed above the zone of combustion, and a combustion chamber, said partitions being foreshortened at alternately opposite ends thereby to form a continuous line at the rearof said combustion chamber, eachof said partitions comprising a plurality of VGl'blCtLl pipes forming a closed wall merging at its upper and lower ends in transversely extending manifolds, said manifolds being connected with the'inner wall of the metal housing and communicating at their opposite ends with the water space of the metal jacket.

In testimony whereof I have signed my name .to this specification.

MICHAEL TRESCHOW. 

